import numpy as np
import pandas as pd
np.random.seed(0)# Simulate cumulative returns of 100 days
N =100
D = pd.DataFrame(np.random.normal(size=N))
R = D.cumsum()# Calcute returns ratio
r =(R - R.shift(1))/R.shift(1)
sr = r.mean()/r.std()* np.sqrt(252)print("sharpe ratio =", sr)